1. Design a canal with a trapezoidal cross section to carry a design discharge of irrigation water of 900 cfs. The slope of the canal is to be 0.002. The canal is to be lined with unfinished concrete, and it is to have the best hydraulic section for the design flow.
2. Critical flow _____. (Select all of the following that are correct.)
a. occurs when specific energy is a minimum for a given discharge.
b. occurs when the discharge is maximum for a given specific energy.
c. occurs when Fr
d. occurs when Fr = 1.
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